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  2. Earthworm - Wikipedia

    en.wikipedia.org/wiki/Earthworm

    An earthworm is a soil -dwelling terrestrial invertebrate that belongs to the phylum Annelida. The term is the common name for the largest members of the class (or subclass, depending on the author) Oligochaeta. In classical systems, they were in the order of Opisthopora since the male pores opened posterior to the female pores, although the ...

  3. Oligochaeta - Wikipedia

    en.wikipedia.org/wiki/Oligochaeta

    Oligochaeta (/ ˌɒlɪɡəˈkiːtə, - ɡoʊ -/) [1] is a subclass of soft-bodied animals in the phylum Annelida, which is made up of many types of aquatic and terrestrial worms, including all of the various earthworms. Specifically, oligochaetes comprise the terrestrial megadrile earthworms (some of which are semiaquatic or fully aquatic), and ...

  4. Pharynx - Wikipedia

    en.wikipedia.org/wiki/Pharynx

    The "pharynx" of the nematode worm is a muscular food pump in the head, triangular in cross-section, that grinds food and transports it directly to the intestines. A one-way valve connects the pharynx to the excretory canal. Everted pharynx of Alitta virens (also known as Nereis virens), lateral view.

  5. Annelid - Wikipedia

    en.wikipedia.org/wiki/Annelid

    The annelids (/ ˈænəlɪdz /), also known as the segmented worms, comprise a large phylum called Annelida (/ əˈnɛlɪdə /; from Latin anellus 'little ring'). [3][a] It contains over 22,000 extant species, including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecologies – some in marine environments ...

  6. Lumbricus terrestris - Wikipedia

    en.wikipedia.org/wiki/Lumbricus_terrestris

    Earthworm head. Lumbricus terrestris is relatively large, pinkish to reddish-brown in colour, generally 110–200 millimetres (4.3–7.9 in) in length and about 7–10 millimetres (0.28–0.39 in) in diameter. It has around 120–170 segments, often 135–150. The body is cylindrical in the cross section, except for the broad, flattened ...

  7. Lumbricus - Wikipedia

    en.wikipedia.org/wiki/Lumbricus

    It is about 90–300 mm long, and has around 110–160 segments. Lumbricus festivus is not found in large numbers. It is red-brown, lighter ventrally, iridescent dorsally. The body length varies from 48 to 108 mm, with about 100–143 segments. Lumbricus badensis, the giant earthworm, also belongs to this genus.

  8. Polychaete - Wikipedia

    en.wikipedia.org/wiki/Polychaete

    Polychaetes are segmented worms, generally less than 10 cm (4 in) in length, although ranging at the extremes from 1 mm (0.04 in) to 3 m (10 ft), in Eunice aphroditois. They can sometimes be brightly coloured, and may be iridescent or even luminescent. Each segment bears a pair of paddle-like and highly vascularized parapodia, which are used ...

  9. Planarian - Wikipedia

    en.wikipedia.org/wiki/Planarian

    Unidentified planarian. Planarians (triclads) are free-living flatworms of the class Turbellaria, [2][3] order Tricladida, [4] which includes hundreds of species, found in freshwater, marine, and terrestrial habitats. [5] Planarians are characterized by a three-branched intestine, including a single anterior and two posterior branches. [5]